The more you eat, the more you toot...

Tonite at dinner, Dr. D got sent into time-out for passing gas at the table.  He does this out one end or the other almost daily, so we are trying to break that bad habit.  He finished his dinner not too long after returning to the table and as he was clearing his plate...here came more toots.  He laughed and said, "Why do I keep farting?  Maybe there is something in my pocket!"  (checks pocket)  "Hmm.  Nothing".  A shrug and then continues walking to the kitchen with his plate.
I wonder what could have been in his pocket to cause such a thing?  :)